Holset Engineering Company, Limited

Anthony Billington

John Frederick Parker

A turbocharger comprises a compressor wheel () assembled to one end of a turbocharger shaft (). A nut () is threaded on to the end of the shaft () to clamp the wheel () on the shaft to prevent both axial movement of the wheel () along the shaft () and rotational slippage. The torque capacity of the coupling between the compressor wheel () and nut () is increased by treating contacting surfaces of the coupling to increase their co-efficient of friction.

Compressor wheel assembly

A compressor wheel assembly comprises a compressor wheel () mounted to a rotating shaft (), which extends through a bore provided along the rotational axis of the wheel (). The wheel () is keyed to the shaft () such that rotation of the shaft () drives rotation of the wheel through the keying engagement.

A turbocharger in which a drive shaft supports at one end a turbine driven by exhaust gases from an internal combustion engine. The end of the drive shaft remote from the turbine supports a drive connection which is coupled to an output shaft of the driving engine. The shaft is supported in a housing by a first bearing adjacent the turbine and a second bearing adjacent the drive coupling. The first and second bearings each define an inner bearing surface relative to which the shaft rotates and an outer bearing surface which rotates relative to the housing. The first and second bearings are mechanically coupled together such that they rotate relative to the housing at the same speed. Coupling the two bearings together ensures that directional forces applied to the bearing at the end adjacent the drive connection which might cause that bearing to seize are resisted by torque delivered from the bearing at the other end of the shaft.

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Thurstonland, United Kingdom

Anthony Billington